• Weed & Turfgrass Science
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• 제6권1호
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• pp.40-54
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• 2017

전통 장례 문화의 봉분 무덤은 적절한 관리에서 지속되는 잔디(Zoysia japonica) 뗏장을 바탕으로 하는 독특한 서식처이다. 본 연구는 지리적으로 최남단 분포의 애기자운이 출현하는 잔디 우점 이차초원식생에 대한 군락분류학적 기재이다. 현지 식생조사와 식생조사표 모둠화를 통한 단위식생의 추출은 Z.-M.학파의 식물사회 분류법을 따랐다. 유형화된 단위식생은 생태식물상 형질 분석과 선행 기재 단위식생과의 종조성적 비교가 성취되었다. 잔디-애기자운군집(신칭)이 처음으로 기재되었고, 김의털아군집, 전형아군집, 토끼풀아군집의 하위단위를 포함한다. 이들 아군집은 접근성과 관리양식에 대응한 종조성의 차이에서 구분되었다. 본 군집은 <지역생물기후구-대구형> 속에서 강한 대륙성 환경조건을 갖춘 미세 서식처에서만 분포하는 지역(regional) 식생형이면서 국지(local) 식생형으로 규정되었다. 잔디-애기자운군집은 대륙형 이차초원식생 가운데 한국인의 봉분 문화에 잇닿은 '뗏장초원식생'이고, 해양형의 잔디군단(억새군강, 양지사초군목)과 전혀 다른 식생형인 것으로 밝혀졌다. 잔디 우점의 이차초원식생일지라도 초지의 식물종다양성과 잔디-애기자운군집의 현지내 보존을 위하여 봉분을 포함한 뗏장에 대한 서식처로서의 이해와 적절한 생태적 관리가 요구되었다.

• 환경생물
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• 제21권2호
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• pp.194-202
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• 2003

남조류의 대발생이 자주 발생하는 석촌호수와 팔당호로부터 시료를 채취하여 남조류 분해세균의 분리를 시도하였다. MDM배지 상에서 Anabaena cylindrica를 숙주로 하는 over-layer method를 이용하여 Anabaena cylindrica lawn에서 남조류 분해 세균을 분리하여 HY0210-AK1으로 명명하였다. HY0210-AK1의 형태적, 생화학적 특성은 Rhizobium속과 유사하였으며, 16S rDNA 염기서열을 분석한 결과 Sphingobium herbicido vorans IFO 16415$^{T}$ 와 99.1%의 높은 유연관계를 보여 Sphingobium herbicidovorans HY0210-AK1로 동정하였다. 잠복기, 대수성장기, 정체기에 있는 Sphingobium herbicidovorans HY0210-AK1를 Anabaena cylindrica NIES-19와 혼합 배양하였을 때, 접종 초기에는 정체기의 Sphingobium herbicidovorans HY0210-AK1를 접종한 처리구에서 가장 좋은 살조 효과를 나타냈으나, 접종 7일 이후에는 커다란 차이를 보이지 않았다 또한,Sphingobium herbicidovorans HY0210-AK1는 $1\times 10^{8}$ CFU $ml^{-1}$ 이상의 농도로 처리하였을 때, Anabaena cylindrica NIES-19가 완전히 분해되었다. Sphingo bium herbicidovorans HY0210-AK1와 Anabaena cylin dricaNIES-19를 혼합 배양한 상등액을 여과하여 접종 하였을때는 납조류 성장 저해 효과가 나타나지 않았다. 따라서 Sphingobium herbicidovorans HY0210-AK1는 Anabaena cylindrica NIES-19를 직접 공격하여 분해하는 것으로 사료된다. Sphingobium herbicidovorans HY0210-AK1는 Microcystis aeruginosa 분해하였다..

• 한국조경학회지
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• 제21권1호
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• pp.13-30
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• 1993

The purpose of this study was to present data to the landscape planning and design through analyzing correlation between visual preference of users and nonusers and the landscape of hole in golf couses. Stimulus objects were selected from the 18 holes in Tae-gu Country Club. Preference value was judged through photo simulation by 35 subjects photographed at Tee and Interpoint (IPI, IP2), and classified into three landscape types and nine landscape components from photo analysis by researcher. For test of difference between groups toward each stimulus, t-test was used, and Duncantest, Correlation analysis for finding out correlation between preference degree and the landscape of each hole. The results of this study were as follows: As a result of analysis of preference value between groups for each hole, it has been shown that there was scarcely difference with each other. Form the relation between preference degree and spacial structure of hole, the holes making up a superior preference group have been shown that the greater part of the holes had a downward slope or a gentle slope mostly and then a visible ratio of fairway was high, and had diversified scenery by a lotus pond, a solitary planting tree, the roll of a fairway, facilities for convenience, etc. The holes making up a low-ranking preference group have been shown that the greater part of the holes had upward slope or a similar slope to it and had characteries of the bad condition of lawn, the nearby factories and odors, the monotonous scenery of a fairway, an unreasonable mixing of holes, etc. From the relation between preference degree and landscape components forming hole, it has been shown that the preference degree between users and nonusers had positive correlation to the occupied ratio of space of landscape components at Tee and Approach. At Tee, it has been shown that the preference degree of two groups were related with a lawn surface of fairway negatively, a lotus pond, a sky positively, and the preference degree of nonusers was related with iron-top for electric transmission positively. At Approach, it has been shown that the preference degree of two groups were related with iron-top for electric transmission negatively, and the preference degree of nonusers was related with a building positively. From the relation between preference degree group to each hole and the occupied ratio of space of landscape types, it has been shown that the constituent ratio of a high-ranking group was 1:2.4:2.2 and a low-ranking group was 1:4.1:5.1 among vertical type, horizontal type and background at Tee, but the constituent ratio of space of a high-ranking group was similar to a low-ranking group at Approach.

• 한국식품과학회지
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• 제40권6호
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• pp.669-673
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• 2008

청국장 내에 B. cereus을 효과적으로 저지하기 위한 생물학적제어 방법의 개발을 위하여 전통적 방법으로 제조한 백태 및 흑태 청국장으로부터 총 20종의 Bacillus 속 균주를 분리하였고, 이중에서 24시간 배양액에서 B. cereus에 대한 길항활성이 가장 높은 Bacillus sp. SC-8 균주를 선별하였다. 이 균주를 B. cereus와 혼합하여 청국장을 제조한 후 길항능을 분석한 결과 청국장 발효 중에는 B. cereus에 대한 길항효과가 있었으나, 발효 후 $4^{\circ}C$ 저장 중에는 균체수가 감소하여 억제효과가 감소하는 것으로 분석되었다. 또한 대조군으로 사용하였던 Bacillus sp. SC-15 균주에서는 배양액에서는 B. cereus에 대한 길항 활성이 낮았으나 청국장 내에서는 길항효과를 보임에 따라 청국장 발효에 관여하는 균들은 배양 환경에 따라 길항물질의 생성에 차이가 있음을 보였다.

• 한국환경농학회지
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• 제21권1호
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• pp.31-37
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• 2002

중금속 오염토양에 대한 식물학적 복원에 적합한 식물종 탐색을 위하여 수목류 5종, 화훼류 2종 및 잔디를 대상으로 제련소 인근 중금속 오염지 포장에서 3년간 재배하여 연차별로 식물중에 흡수된 중금속 함량을 조사하였다. 식물의 건물중은 양황철, 팽나무, 적단풍, 사철나무, 회양목 순이었고, 연차별 건물중의 증가도 팽나무, 양황철, 적단풍이 높게 나타났다. 식물의 중금속은 지하부가 지상부보다 높은 함량을 보였으며, 식물중 회양목은 뿌리에서 매우 높게 나타났다. 공시식물의 3년차 총 흡수량은 카드뮴이 양황철, 팽나무, 단풍나무, 구리가 팽나무, 양황철, 회양목, 납이 양황철, 팽나무, 단풍나무, 비소가 회양목, 단풍나무, 양황철 순으로 높게 나타났다. 이상의 결과에서 식물의 건물중과 중금속 흡수량을 볼 때 양황철, 회양목, 단풍나무 및 팽나무 등이 중금속으로 오염된 토양에 대한 정화 식물로 이용할 수 있을 것으로 생각되었다.

• 한국토양비료학회지
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• 제31권4호
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• pp.368-372
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• 1998

한국산 잔디를 미사질 식양토에 경량기포 콘크리트 부산물(ALC)를 2.0, 4.0, $6.0Mg\;ha^{-1}$의 처리구별로 시용하고 재배하였을 때 잔디의 생육상태, 무기양분의 흡수와 수량 및 시험후의 토양의 화학적 성질변화에 미치는 영향을 포장시험에 의하여 조사한 결과는 다음과 같다. 잔디 이식 180일 후의 지상포복졍의 총길이, 지상포복경수 및 지상포복경수당 길이는 ALC $2.0{\sim}6.0Mg\;ha^{-1}$구에서는 증가하였고 $8.0Mg\;ha^{-1}$구에서는 감소하였다. 잔디 수확후의 생체중과 건물중은 ALC $6.0Mg\;ha^{-1}$구에서 가장 많았고 $8.0Mg\;ha^{-1}$구에서는 오히려 감소하였으며 ALC 처리구간에 유의성이 인정되었다. 수확기에 잔디의 무기성분 중 Si와 Ca는 ALC 처리량이 많을수록 높았고 기타성분은 차이가 크지 않았다. 시험후의 토양의 pH는 특히 ALC 시용량이 많을수록 pH는 5.7~6.4까지 상승하였으며 Si는 $19{\sim}28Mg\;ha^{-1}$ 수준으로 높았다.

• 한국환경과학회지
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• 제22권4호
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• pp.397-406
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• 2013

With the methodology of AHP, this paper focuses on communication activities and their constituents in city parks, selecting 11 constituents, natural or artificial, and establishes an evaluation model on the basis of the analysis of the characteristics of tourists' communication activities in order to obtain the weight and order of importance of the constituents of communication activities space. First-grade indicators influence weight and the order of the constituents of communication activities space are: artificial constituents (0.6614) > natural constituents (0.3386). The weight and order of five secondary indicators attached to natural constituents: private space (0.1538) > shade tree (0.0955) > gentle slope mound (0.0474) > beautiful waterscape (0.0270) > sunshine lawn (0.0149); the weight and order of six secondary indicators attached to artificial constituents: field boundary (0.2865) > Leisure chairs (0.1843) > resting areas (0.0795) > appropriate square (0.0533) > tree-lined road (0.0352) > landscape sketch (0.0227).Using modern decision analysis methodology to research the relationship of environment constituent elements has great theoretical and practical significance for the scientific design and construction of suitable environment for human needs.

• Journal of Mechanical Science and Technology
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• 제18권8호
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• pp.1401-1417
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• 2004

Experimental and computational studies were performed to determine the effects of different blade designs on a flow pattern inside a double-spindle counter rotating mower deck. In the experimental study, two different blade models were tested by measuring air velocities using a forward-scatter LDV system. The velocity measurements were taken at several different azimuth and axial sections inside the deck. The measured velocity distributions clarified the air flow pattern caused by the rotating blades and demonstrated the effects of deck and blade designs. A high-speed video camera and a sound level meter were used for flow visualization and noise level measurement. In the computational works, two-dimensional blade shapes at several arbitrary radial sections have been selected for flow computations around the blade model. For three-dimensional computation applied a non-inertia coordinate system, a flow field around the entire three-dimensional blade shape is used to evaluate flow patterns in order to take radial flow interactions into account. The computational results were compared with the experimental results.

• 한국해양공학회지
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• 제17권6호
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• pp.83-90
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• 2003

This paper presents an underwater hybrid navigation system for a semi-autonomous underwater vehicle (SAUV). The navigation system consists of an inertial measurement unit (IMU), and a Doppler velocity log (DVL), accompanied by a magnetic compass. The errors of inertial measurement units increase with time, due to the bias errors of gyros and accelerometers. A navigational system model is derived, to include the scale effect and bias errors of the DVL, of which the state equation composed of the navigation states and sensor parameters is 20. The conventional extended Kalman filter was used to propagate the error covariance, update the measurement errors, and correct the state equation when the measurements are available. Simulation was performed with the 6-d.o,f equations of motion of SAUV, using a lawn-mowing survey mode. The hybrid underwater navigation system shows good tracking performance, by updating the error covariance and correcting the system's states with the measurement errors from a DVL, a magnetic compass, and a depth sensor. The error of the estimated position still slowly drifts in the horizontal plane, about 3.5m for 500 seconds, which could be eliminated with the help of additional USBL information.

• Journal of Microbiology and Biotechnology
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• 제10권4호
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• pp.488-495
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• 2000

Strain SA72 was isolated from Jeot-gal and identified as producer of a bacteriocin, which showed some bactericidal activity against Lactobacillus delbrueckii ATCC 4797. Strain SA72 was tentatively identified as Lactococcus lactis according to the AOI test. Lactococcus lactis SA72 showed a broad spectrum of microorganisms, tested by the modified deferred method. The activity of lacticion SA72, named tentatively as a bacteriocin produced by Lactococcus lactis SA72, was detected during the mid-lon growth phase, reached a maximum during the early stationary phase, and then declined after the late stationary phase. Lacticin SA72 also showed a relatively broad spectrum of activity against non-pathogenic and pathogenic microorganisms when assessed by the spot-on-lawn method. Its anitimicrobial activity on sensitive indicator cells disappeared completely by protease XIV treatment. The inhibitory activity of lacticin SA72 remained after treatment for 15 min at $121^{\circ}C$, 문 was stable in a pH range of 2.0 to 9.0 and all organic solvents examined. It demonstrated a typical bactericidal mode of inhibition against Lactobacillus delbrueckii ATCC 4797. The apparent molecular mass of lacticin SA72 was in the region of 3-3.5 kDa, determined by SDS-PAGE.